Transformer DC Resistance TesterDetailed product description：

ZGY-20A Transformer DC Resistance Tester

I. Overview
The DC resistance of transformers is a necessary test item for semi-finished and finished products in transformer manufacturing, factory testing, installation, handover testing, and preventive testing by the power department. It can effectively detect manufacturing defects such as material selection, welding, loose connection parts, missing strands, and broken wires of transformer coils, as well as hidden dangers after operation. In order to meet the needs of rapid measurement of transformer DC resistance, this instrument adopts a new power supply technology, which has the characteristics of small size, light weight, and large output current. The whole machine is controlled by a microcontroller, which automatically completes self checking, data processing, display and other functions, and has automatic discharge and discharge indication functions. The instrument has high testing accuracy, easy operation, and can achieve rapid measurement of transformer direct resistance.

2、 Safety measures for ZGY-20A transformer DC resistance tester
1. Before using this instrument, be sure to read this manual carefully.
2. The operator of the instrument should have general knowledge of using electrical equipment or instruments.
3. This instrument can be used both indoors and outdoors, but should be avoided from places such as rain, corrosive gases, excessive dust, high temperatures, and direct sunlight.
4. Instruments should avoid severe vibrations.
5. The maintenance, care, and adjustment of instruments should be carried out by professionals.
6. After the test is completed, be sure to wait for the discharge alarm to stop before turning off the power and removing the test line.
7. When measuring an unloaded voltage regulating transformer, be sure to wait for discharge before switching gears.
8. During the testing process, it is prohibited to move the test clamp and power supply line.

3、 Performance characteristics of ZGY-20A transformer DC resistance tester
1. The instrument has a high output current and is lightweight.
2. It has a complete protection circuit and strong reliability.
3. Panel structure, convenient for on-site operation.
4. Equipped with sound discharge alarm, clear discharge indication, and reduced misoperation.

4、 Technical indicators
1. Output current: 5A, 10A, 20A
2. Output voltage: DC220V
3. Range: 0-10 Ω
4. Accuracy: 0.2% ± 0.5 μ Ω
5. Minimum resolution: 0.1 μ Ω
6. Display digits: Four digits
7. Working temperature: -20~40 ℃
8. Environmental humidity: ≤ 80% RH, no condensation
9. Working power supply: AC220V ± 10%, 50HZ ± 1HZ
10. Volume: 370mm in length, 290mm in width, and 230mm in height
11. Net weight: 8Kg

5、 Packing list

ZGY resistance tester host (20A configuration)	a
20A type test line	a set
Three core power cord	a strip
Insurance pipe 5A	three
Certificate of Conformity/Warranty Card	a
Operation Manual	a book